const pi = Math.PI;

class Circle {
  constructor(radius) {
        this.#r = radius;
          
  }

  get diameter() {
        return 2 * this.#r;
          
  }

  get circumference() {
        return pi * 2 * this.#r;
          
  }

  get area() {
        return pi * this.#r * this.#r;
          
  }

    #r = 0;

}

module.exports = Circle;

console.log(module);
